Extension step-ladder



(No Model.) 2 Sheets-Sheet 1. G. W. STAMBAUGH.

EXTENSION STEP LADDER.

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2 Sheets-Sheet 2.

(No Model.)

G. W. STAMBAUGH.

' EXTENSION STEP LADDER.

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UNITED STATES PATENT FFICE.

GEORGE W. STAMBAUGH, OF TROY, ILLINOIS.

EXTENSION STEP-LADDER.

SPECIFICATION forming part of Letters Patent No. 274,526, dated March27, 1883. Application filed December 22, 1882 (No model.)

To all whom it may concern:

Beit known thatI, GEORGE W. STAMBAUGH, a citizen of the United States,residing at Troy, in the county of Madison and State of Illinois, haveinvented a new and useful Extension Step-Ladder, of which the followingis a specification, reference being bad to the accompanying drawings.

This invention relates to extension step-ladders, and has for its objectto provide a simple, durable, inexpensive, and efiicient ladder, thatcan be quicklyand conveniently extended, and that can also be readilydisconnected from its supports so that it can be used as an ordinaryladder when desirable.

In the drawings, Figure 1 is a perspective view of the ladder contractedand in position for use. Fig. 2 is a like view, illustrating the ladderextended. Fig. 3 is a side view, showing the ladder folded in positionfor transportation. Fig. 4 is a rear elevation of the ladder.

Fig. 5 is a horizontal sectional view on the line z a, Fig. 1.

Referring to the drawings, A A designate hook-shaped plate, G, that ispivoted to the bracket D and engages a groove, H, in the end of the boltF. By elevating this latch-plate G the boltF can be removed, when thesupports E may be separated from the ladder proper, so

i as to admit of the latter being used like an ordinary ladderindependent of the supports.

These supports E E are connected and braced.

at the top and bottom by cross-pieces 1 J, respectively, and have theirtop ends, K, beveled to facilitate their engagement with a bail, L,pivoted at the top of the side pieces A A. When the ladder is out of usethese bails L L will be disengaged'from the ends of the supports and thelatter will be folded up against the ladder proper. Now, when it isdesired to use the ladder the supports, have only to be drawn out fromthe ladder, while the said bails automatically fall over the ends of thesupports and serve to retain them in position.

M designates an auxiliary support, that is adjustable on the supports EE, and is provided with side pieces N N, which are connected by crossbraces O 0 at the top, like braces P P, disposed some distance from andbelow the braces 0 O, and braces Q Q at the bottom. The supports E E arereceived between these various cross-braces and have their inner edgesprovided with notches R, that are transversely cut but disposed in alongitudinal series down each of the supports. Any of these notches areadapted to be engaged by one of a pair of bails, S S, pivoted on thecross-braces P P, and arranged to swing over and engage the desirednotch to retain the pivoted supports and the auxiliary'supports in therelative position to been adjusted.

T designates an auxiliary step extension,

which they may have .which comprises side pieces U U, united by parallelcross-strips V, which form steps. The main-step portion of this improvedladder is accommodated between these cross-strips V, and the two stepportions slide together to extend or contract the ladder. One of thesteps B, near the bottom, is provided at each side with a lug or pin, W,on which slides a slotted plate, X, that can bedrawn forward, as shown,to project over any of the cross-strips of the auxiliary-ladder portion,and thereby retain the ladder-step portions in the relative position towhich they have been adjusted.

Y Y designate two rods, one of which is pivoted at the side of each ofthe side pieces A A that are provided with a series of perforations, anyof which is adapted to engage a pin, a, projecting from the side of eachof the side pieces N N to brace the step portions and supports when theladder is extended. 7

The operation and advantages of my invention are obvious. Theconstruction is simple and not liable to displacement, while theadjustment can be eifected with superior facility and convenience. W'hendesired, the auxiliary steps and supports can be jointly orindependently removed entirely from the ladder, and either the step orsupporting section can be independently adjusted to adapt the ladder touneven surfaces.

I claim as my invention- 1. In a stepladder, the combination of a stepportion, supports pivotally connected therewith, and bails pivoted tothe step portion and adapted to engage the top ends of the supportsabove their pivot connection with the step portion, as set forth.

2. In a step-ladder, the combination of a step portion, bracketsextending from the same at the top, supports pivoted to said brackets bya cross-pin, and bails pivoted to the step v portion and adapted toengage the tops of the supports, as set forth. 4

3. In an extension step-ladder, the combination of the main-step portionof the ladder having oneof its stepsat the bottom provided on its topsurface with lugs or pins, slotted plates working on these pins, so asto project out over the step, and an auxiliary-step portion comprisingside pieces connected by parallel cross-strips between which themain-step portion slides, as set forth.

GEORGE WASHINGTON STAMBAUGH.

Witnesses:

HENRY H. PADON, JOHN S. PETERMAN.

